Improved Operation of Continuous Ozone Hydrate Production

Abstract

In a previous study, we have experimentally demonstrated the continuous formation of O3+O2+CO2 hydrate. Here, improved results for the O3+O2+CO2 hydrate formation are reported. By forming O3+O2+CO2 hydrate at a low temperature and higher O3 gas concentration in the gas phase, the O3 concentration in the hydrates was increased to be 0.41 mass %, which was 1.6 times higher than our past record. One‐quarter reduction of the induction time for O3+O2+CO2 hydrate formation was also achieved by raising the initial volume ratio of CO2 in the feed gas in the range of 2–2.9 times that of our previous study. Also, the overall heat transfer coefficient during O3+O2+CO2 hydrate continuous formation was experimentally determined.

Crystal Structure and Guest Distribution of N2O Hydrate Determined by Powder X-ray Diffraction Measurements

“…5−7 Few studies have been conducted at the pilot scale for practical applications. 8,9 Recently, carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) hydrates of sI hydrates have gained attention concerning gas separation and storage of greenhouse gases. In particular, CO 2 forms sI hydrates, which have been intensively studied for the separation of CO 2 from flue gas or deep-sea disposal of CO 2 through CO 2 hydrate formation.…”

“…Studies on storing methane (CH 4 ) or natural gas (CH 4 and hydrocarbons such as ethane (C 2 H 6 ) or propane) employing hydrates have been performed. In addition, hydrogen or ozone storage in hydrates has been investigated. − Few studies have been conducted at the pilot scale for practical applications. , Recently, carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) hydrates of sI hydrates have gained attention concerning gas separation and storage of greenhouse gases. In particular, CO 2 forms sI hydrates, which have been intensively studied for the separation of CO 2 from flue gas or deep-sea disposal of CO 2 through CO 2 hydrate formation. − Numerous crystallographic investigations have been performed to discern the physical properties of CO 2 hydrates.…”